CN113131713B

CN113131713B - Base of voice coil motor and combination thereof

Info

Publication number: CN113131713B
Application number: CN202110531840.0A
Authority: CN
Inventors: 罗勇; 诸渊臻; 胡炜; 刘松华
Original assignee: Suzhou Yunzhong Electronic Technology Co ltd
Current assignee: Suzhou Yunzhong Electronic Technology Co ltd
Priority date: 2021-05-17
Filing date: 2021-05-17
Publication date: 2022-06-07
Anticipated expiration: 2041-05-17
Also published as: CN113131713A

Abstract

The invention relates to a base of a voice coil motor and a combination thereof, wherein the base combination of the voice coil motor comprises a base and an electronic component, the base of the voice coil motor comprises a plastic base and a metal circuit arranged on the plastic base, the electronic component is attached to the upper surface of the plastic base and is electrically welded with the metal circuit, the metal circuit comprises a plurality of branches, one ends of the branches are arranged at intervals to form pin ends, the other ends of at least two branches in the branches are arranged to form welding ends, the welding ends are exposed on the upper surface, each welding end comprises a main body part and at least one convex hull arranged on one side, close to the electronic component, of the main body part in a protruding mode, and the welding ends and the electronic component are welded through tin paste. The base and the combination of the voice coil motor solve the problem of insufficient soldering or empty soldering when the welding end of the metal circuit and the electronic element are soldered by solder paste, and ensure the production yield.

Description

Base of voice coil motor and combination thereof

Technical Field

The invention relates to the technical field of voice coil motors, in particular to a base of a voice coil motor and a combination of the base.

Background

The conventional voice coil motor with a driving assembly generally includes a plastic base, a metal circuit disposed in the plastic base, an electronic component welded to the metal circuit, a coil formed by winding or mounted and assembled, and a magnetic structure interacting with the coil. The Flexible Printed Coil (FP-Coil) in the driving assembly is usually attached to the base of the voice Coil motor equipped with a metal circuit through smt (surface Mount technology), so as to solder the Flexible Printed Coil to the metal circuit in the plastic base for circuit connection. As in the utility model publication No. CN209928110U, the second driving coil embedded in the circuit board is directly soldered and fixed to the soldering portion of the metal circuit via solder. When the metal circuit is welded and fixed, the welding part of the metal circuit in the plastic base is flush with the plastic base, the solder paste is coated on the welding part, and then the coil is attached to realize reflow soldering. Because the solder paste consists of the soldering flux and the solder metal powder according to the volume ratio of 1:1, the volume of the cured solder metal is only half of the volume of the original solder paste, when the amount of the solder paste is large, the solder paste has certain ductility at high temperature, the coil is attached to the solder paste on the welding part, the solder paste can be pressed and expanded, the solder paste can exceed the area of the welding part of the metal circuit, and the solder paste pressed and expanded out of the welding part can not be effectively contracted and returned to the position between the welding part and the coil due to the attachment of the coil during the reflow curing of the solder paste, so that solder beads can be formed on the plastic base to cause short circuit. When the amount of the solder paste is small, the solder paste on the soldering portion cannot be fully spread, and after the solder paste is spread by the coil, the coil and the soldering portion are subjected to empty soldering or cold soldering, which causes poor soldering and lowers productivity.

Therefore, there is a need to provide a new base of a voice coil motor and a combination thereof to overcome the above-mentioned drawbacks.

Disclosure of Invention

The invention aims to provide a base of a voice coil motor and a combination thereof, which are used for solving the problem of empty soldering or cold soldering between electronic components such as a flexible printed coil and the like and a soldering terminal and improving the manufacturing yield of the base of the voice coil motor and the combination thereof.

The purpose of the invention is realized by the following technical scheme one: a base combination of a voice coil motor comprises a base of the voice coil motor and an electronic component which are mutually matched, wherein the base of the voice coil motor comprises a plastic base and a metal circuit arranged on the plastic base, the electronic component is attached to the upper surface of the plastic base and is electrically welded with the metal circuit, the metal circuit comprises a plurality of branches, one ends of the branches are arranged at intervals to form pin ends exposed outside the plastic base, the other ends of at least two branches in the branches are arranged to form welding ends welded to the electronic component, the welding ends are exposed on the upper surface of the plastic base, the upper surface of the plastic base is concavely provided with a containing groove, the containing groove is provided with a bottom surface, and each welding end comprises a main body part and at least one convex hull convexly arranged on one side, close to the electronic component, of the main body part, the main body part is provided with an upper wall surface exposed to the accommodating groove, the convex hull is arranged in a protruding mode from the upper wall surface to the electronic element, the area of the upper wall surface is smaller than that of the bottom surface, and the welding end and the electronic element are welded through solder paste.

Further, the convex hull is a cylindrical or arch bridge-shaped structure protruding from the main body portion, and the area of the convex hull is smaller than that of the upper wall surface of the main body portion.

Furthermore, the electronic element is provided with a conducting strip corresponding to the convex hull, a gap is formed between the upper surface of the convex hull and the conducting strip, and the solder paste is at least filled into the gap.

Furthermore, the electronic element is provided with a depressed part for accommodating the convex hull, the conducting strip is arranged in the depressed part in an exposed manner, and the thickness of the conducting strip is smaller than the depth of the depressed part.

Furthermore, the depth of the accommodating groove in the vertical direction is smaller than the thickness of the plastic base.

Further, the main body of the welding end is embedded in the accommodating groove, and the upper wall surface is flush with or higher than the bottom surface.

Furthermore, the solder paste comprises soldering flux and tin alloy which are formed by mixing in proportion, the tin alloy at least wraps the upper surface and the periphery of the convex hull, and the soldering flux is at least positioned on the periphery of the main body part in the accommodating groove.

Further, an area ratio of the upper wall surface to the bottom surface of the accommodation groove ranges from 1/2 to 2/3.

Further, the area ratio of the upper wall surface to the bottom surface of the accommodation groove is 7/13.

Further, the branch is made of copper, the upper wall surface of the welding end is plated with metal tin or gold, and the surface of the convex hull is plated with metal tin or gold.

Further, the convex hull is formed by integrally stamping the main body part or riveting the main body part.

Furthermore, the electronic component is a flexible printed coil, the plastic base is provided with a side wall protruding upwards from the periphery of the upper surface and an accommodating cavity formed by the side wall in an enclosing manner, and the flexible printed coil is accommodated in the accommodating cavity and is adhered and positioned with the plastic base through glue.

Further, the welding end is electrically welded with the electronic element through a surface mounting technology.

The purpose of the invention is realized by the following technical scheme II: a base of a voice coil motor comprises a plastic base and a metal circuit arranged on the plastic base, wherein the metal circuit comprises a plurality of branch circuits, one ends of the branch circuits are arranged at intervals to form pin ends exposed outside the plastic base, the other ends of at least two branch circuits in the branch circuits are arranged to form welding ends located in the plastic base, the welding ends are used for being welded with an electronic element, the welding ends are exposed on the upper surface of the plastic base, a containing groove is formed in the upper surface of the plastic base in a concave mode and provided with a bottom surface, each welding end comprises a main body portion and at least one convex hull arranged on the main body portion in a protruding mode, the main body portion is provided with an upper wall surface exposed in the containing groove, the convex hull is arranged from the upper wall surface to the electronic element in a protruding mode, and the area of the upper wall surface is smaller than the area of the bottom surface, and the welding end and the electronic element are welded through solder paste.

According to the base combination of the voice coil motor, the welding end of the branch is arranged on the upper surface of the plastic base, the welding end is provided with the main body part and the at least one convex hull which is convexly arranged on one side, close to the electronic element, of the main body part, the welding end and the electronic element are welded through the tin paste, and the convex hulls guarantee that when the welding end and the electronic element are welded, stable welding between the welding end and the electronic element can be guaranteed no matter the quantity of the soldering tin is large or small, the situations of empty welding, false welding and the like generated when the electronic element and the plastic base are welded are reduced, and the production yield of the base combination of the voice coil motor is improved.

Drawings

Fig. 1 is a perspective view of a base assembly of a voice coil motor according to a first embodiment of the present invention.

Fig. 2 is a view of fig. 1 viewed from another direction.

Fig. 3 is an exploded perspective view of a base assembly of a voice coil motor according to a first embodiment of the present invention.

Fig. 4 is a further exploded perspective view of fig. 3.

Fig. 5 is a further exploded perspective view of fig. 4.

Fig. 6 is a view of fig. 5 viewed from another direction.

Fig. 7 is a perspective view of the metal circuit in fig. 5.

Fig. 8 is a partially enlarged view of fig. 7.

Fig. 9 is a partially enlarged view of fig. 4.

Fig. 10 is a cross-sectional view through the convex hull along line a-a in fig. 1.

Fig. 11 is an enlarged view of a portion of fig. 10 with a large amount of solder paste.

Fig. 12 is an enlarged view of a portion of fig. 10 where the amount of solder paste is small.

Fig. 13 is a partially enlarged view of a metal circuit in the second embodiment of the present invention.

Description of the main elements

Please refer to the following reference numerals, which illustrate the base assembly 1000 of the voice coil motor, the base 100 of the voice coil motor, the plastic base 1, the through hole 10, the upper surface 11, the positioning protrusion 111, the receiving recess 112/113, the bottom surface 1121, the side wall 12, the receiving cavity 13, the metal circuit 2, the branch 20, the pin terminal 21, the soldering terminal 22, the first soldering portion 221/221 ', the main body 2210, the convex hull 2211/2211', the upper wall 2212, the second soldering portion 222, the glue 3, the first glue portion 31, the second glue portion 32, the flexible printed coil 4, the positioning recess 41, the recess 40, the conductive sheet 42, the receiving hole 43, the solder paste 5, the soldering flux 50, the tin alloy 51, the chip 6, and the gap 7.

The following specific embodiments will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or assembly must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the voice coil motor in the prior art, when the flexible printed coil is welded with the welding end of the metal circuit, because the welding end of the metal circuit is flush with the surface of the plastic base, when solder paste is applied to the surface of the welding end, the flexible printed coil is attached to the solder paste on the welding end, the solder paste can be pressed and expanded, and then the solder paste exceeds the surface of the plastic base, and the flexible printed coil cannot be contracted to be between the reflow end and the flexible printed coil during reflow so as to form solder balls without welding effect. When the amount of the solder paste is less, the solder paste on the welding end of the metal circuit cannot be spread by the coil to fill the whole area of the welding end, so that empty welding or less welding is easily caused, and the balance cannot be realized.

According to the invention, the welding end 22 of the metal circuit 2 is arranged in the

accommodating grooves

112 and 113 concavely arranged on the upper surface 11 of the plastic base 1, the area of the

accommodating grooves

112 and 113 is larger than that of the welding end 22, when the welding end 22 is welded with an electronic element (not numbered), the electronic element presses and expands the solder paste 5 on the welding end 22, the solder paste 5 pressed and expanded out of the welding end 22 is effectively accommodated in the

accommodating grooves

112 and 113, and the solder paste 5 can automatically shrink towards the welding end 22 without interference during reflow solidification, so that the formation of solder balls is reduced. And the top end (not numbered) of the soldering terminal 22 protrudes out of the bottom surface 1121 of the

accommodating recess

112, 113, when the amount of the solder paste 5 is small, a small amount of the solder paste 5 is gathered toward the top end of the soldering terminal 22 based on the solder climbing effect, and the amount of the solder paste 5 on the soldering terminal 22 is enough to realize effective soldering between the electronic component and the soldering terminal 22 without causing less soldering or empty soldering, thereby ensuring the production yield and improving the production efficiency. Hereinafter, a detailed description will be given.

In the present invention, there are two embodiments which are different in that the top end of the welding terminal 22 protrudes from the bottom surface 1121 of the

receiving groove

112, 113 in a different shape, and in the first embodiment, the protruding shape is a cylindrical shape formed by punching, while in the second embodiment, the protruding shape is a bridge shape formed by punching, and the other components are identical in the two embodiments. Of course, in other embodiments, the shape of the protrusion may be other shapes that facilitate tin climbing, and is not limited herein.

Referring to fig. 1 to 13, a base assembly 1000 of a voice coil motor is used for driving an Optical component (e.g., a lens) to move along an Optical axis, so as to achieve functions of Auto Focus (Auto Focus) or Optical Image Stabilization (Optical Image Stabilization). The light can pass through the optical assembly to form an image on the photosensitive assembly. The base assembly 1000 of the vcm comprises the base 100 of the vcm and electronic components (not numbered) that are engaged with each other. The base 100 of the voice coil motor comprises a plastic base 1 and a metal circuit 2 arranged in the plastic base 1, the electronic element can be attached to the upper surface 11 of the plastic base 1 through glue, and the electronic element can be a flexible printed coil 4 or a chip 6 or other Hall element type induction elements and other elements.

The metal circuit 2 comprises a plurality of branches 20, one ends of the plurality of branches 20 are arranged at intervals to form pin ends 21 exposed outside the plastic base 1, the other ends of the branches 20 are arranged to form welding ends 22, and the welding ends 22 are electrically welded with the electronic component through a surface mount technology. The soldering terminals 22 of the plurality of branches 20 are divided into two parts, one part of the soldering terminals 22 is soldered to the leads of the flexible printed coil 4, this part of the soldering terminals 22 is called a first soldering part 221, and the first soldering part 221 is exposed in the receiving groove 112 recessed from the upper surface 11 of the plastic base 1; another portion of the bonding terminal 22 is bonded to a lead of the chip 6, the bonding terminal 22 is referred to as a second bonding portion 222, and the second bonding portion 222 is exposed in the receiving recess 113 recessed from the upper surface 11 of the plastic base 1. In the present invention, the branch passage 20 includes at least four branch passages 20 having the first welding parts 221. Each branch 20 includes the pin end 21 extending out of the plastic base 1 and the first welding portion 221 embedded in the plastic base 1 and welded to the flexible printed coil 4. The first soldering portion 221 has a rectangular structure, and has a plate-shaped body 2210 exposed to the plastic base 1 and at least one convex hull 2211 protruding from a side of the body 2210 close to the fpc 4. The welding structure of the first welding portion 221 and the accommodating recess 112 according to the present invention can be used for welding the second welding portion 222 and the chip 6 in the same manner. In the embodiment of the present invention, only the welding structure of the first welding portion 221 and the accommodating recess 112 and the welding method of the flexible printed coil 4 are described in detail, and the welding of the second welding portion 222 and the chip 6 is not described in detail.

Referring to fig. 1 to 11, the plastic base 1 is provided with a sidewall 12 protruding upward from the periphery of the upper surface 11 and a receiving cavity 13 defined by the sidewall 12, and the electronic component, specifically, the flexible printed coil 4 in the present embodiment, is received in the receiving cavity 13 and is adhered and positioned with the plastic base 1 by glue 3. The plastic base 1 is provided with a through hole 10 at the middle position, and the through hole 10 is used for enabling light to pass through the optical component to form an image on the photosensitive component. The plastic base 1 is provided with an upper surface 11, and four positioning bumps 111 which are positioned on the upper surface 11 and surround the through hole 10. In other embodiments, the number of the positioning bumps 111 is not limited, and only the positioning function is used here. The upper surface 11 is further provided with a plurality of receiving grooves 112. The receiving recess 112 is substantially rectangular and has a bottom surface 1121. The receiving groove 112 is located at one side of the positioning protrusion 111. The depth of the accommodating groove 112 in the vertical direction is smaller than the thickness of the plastic base 1, that is, the accommodating groove 112 penetrates through the upper surface 11 but not the lower surface (not numbered) of the plastic base, so as to expose and bear the first welding part 221 of the metal circuit 2 on the upper surface 11. The accommodating groove 113 is used for accommodating and electrically connecting the chip 6. In the present invention, the fpc 4 is located on the upper surface 11 of the plastic base 1, so that the convex hull 2211 also protrudes upwards from the body 2210.

In the first embodiment, the first welding part 221 includes the body part 2210 and the convex hull 2211 of a generally cylindrical shape disposed on the top surface of the body part 2210 and protruding from the bottom surface 1121 of the receiving groove 112. The body 2210 has an upper wall 2212. The body 2210 is fitted into the receiving groove 112. The upper wall surface 2212 of the body portion 2210 has an area smaller than that of the bottom surface 1121. The area ratio of the upper wall surface 2212 of the body portion 2210 to the bottom surface 1121 of the accommodating recess 112 ranges from 1/2 to 2/3 (inclusive) to ensure that a sufficient amount of solder paste for ensuring effective soldering is accommodated in the accommodating recess 112. In the best mode of the present invention, the area ratio of the upper wall surface 2212 to the bottom surface 1121 of the receiving groove 112 is 7/13. The first welding portion 221 is embedded in the accommodating groove 112, so that the first welding portion 221 is not easy to fall off. The upper wall 2212 is flush with the bottom surface 1121 or is higher than the bottom surface 1121. When the upper wall surface 2212 is flush with the bottom surface 1121, the upper wall surface 2212 forms a part of the bottom surface 1121, and the two are on the same horizontal plane, and when reflow soldering is performed, the solder paste 5 is solidified, which facilitates the tin in the accommodating groove 112 to automatically shrink onto the first soldering part 221. The cylindrical convex hull 2211 of the first welding part 221 is welded with the flexible printed coil 4, the area of the convex hull 2211 is smaller than that of the main body part 2210, so that the molten tin on the main body part 2210 can flow upwards (a tin climbing phenomenon) conveniently, effective welding of the first welding part 221 and the flexible printed coil 4 is further guaranteed, and the situations such as insufficient soldering are reduced. When the area of the first soldering part 221 is large enough, the convex hulls 2211 may be provided in plurality, and the plurality of convex hulls 2211 may further increase the amount of the tin flowing upward. Referring to fig. 11, the height of the convex hull 2211 in the vertical direction is greater than the depth of the receiving groove 112 in the vertical direction, and extends upward beyond the upper surface 11. The convex hull 2211 is formed by integrally pressing the body 2210, and has a cylindrical shape in surface contact with the fpc 4. In other embodiments, the convex hull 2211 may be formed by welding or riveting with the body 2210. The height of the convex hull 2211 is set to make the welding range of the first welding part 221 and the flexible printed coil 4 more concentrated, the welding yield is higher, and reliable welding can be formed even if the amount of the solder paste 5 is small.

The glue 3 is roughly annular and is divided into two parts, namely a first glue part 31 and a second glue part 32, and the two parts are used for attaching and positioning the flexible printed coil 4 main body at the corresponding position of the plastic base 1.

In the embodiment of the present invention, the electronic component is specifically the flexible printed coil 4, which is a patch type flexible printed coil and has a positioning groove 41 corresponding to the positioning protrusion 111 of the plastic base 1. The fpc 4 is further provided with receiving holes 43 corresponding to the through holes 10, in order to allow light to pass through the optical elements. The fpc 4 has a recess 40 for accommodating the convex closure 2211 and a conductive strip 42 corresponding to the convex closure 2211 and located in the recess 40. The thickness of the conductive sheet 42 is smaller than the depth of the recess 40. The shape of the recess 40 is adapted to the shape of the convex hull 2211. A gap 7 is formed between the upper surface of the convex hull 2211 and the conductive sheet 42, and the solder paste 5 is filled at least to the gap 7 during soldering. The shape of the conductive tab 42 also accommodates the shape of the convex hull 2211. The area of the conductive sheet 42 is smaller than that of the receiving groove 112. The conductive sheet 42 is welded to the first welding portion 221 disposed on the plastic base 1.

In the present application, the branch 20 of the metal circuit 2 is made of copper, and the surface of the first soldering portion 221 is plated with gold or tin to facilitate tin plating on the first soldering portion 221. The main body of the convex hull 2211 is made of copper or stainless steel, and the surface of the convex hull 2211 is plated with gold, tin or other metals capable of generating tin-climbing phenomenon with tin, preferably gold is plated on the surface of the convex hull 2211. The convex hull 2211 is preferably a cylindrical body, which is beneficial to efficient molding, and the outer edge of the arc surface is beneficial to tin flowing upwards to the top surface of the convex hull 2211, so as to form reliable welding.

In the present invention, the solder paste 5 attached to the first soldering portion 221 may generate a solder climbing phenomenon. The so-called "tin climbing phenomenon" is also called capillary phenomenon, that is, during soldering, the tin alloy 51 corresponds to an adhesion layer on the surface of the bump 2211, and since the tin alloy 51 and the bump 2211 are made of metal, the tin alloy 51 generates an upward force in view of molecular stress, so that the tin alloy 51 automatically flows upward, and even if the amount of the tin paste 5 is small, the tin alloy 51 adheres to the top surface of the bump 2211. The solder paste 5 includes a flux 50 and a tin alloy 51 mixed in proportion, the tin alloy 51 covers at least the upper surface and the periphery of the convex hull 2211, specifically, the tin alloy 51 covers the entire upper surface and the periphery of the convex hull 2211, and the tin alloy 51 only partially covers the upper surface and the periphery of the convex hull 2211, that is, in practical applications, there may be a case where no tin alloy 51 is provided on part of the upper surface or/and part of the periphery, but the tin alloy 51 is considered to be covered as the present invention as long as the tin alloy 51 is provided on the surface or the periphery. The flux 50 is at least located around the body 2210 in the receiving groove 112. In the invention, the solder paste 5 consists of the soldering flux 50 and the metal powder tin according to the volume ratio of 1:1, and the volume of the solidified tin metal is only half of the volume of the original solder paste.

Referring to fig. 11, in the present invention, when there is a large amount of solder paste 5 on the first soldering portion 221, the solder paste 5 is still gathered in the accommodating recess 112 of the plastic base 1 except for the first soldering portion 221, and when the flexible printed coil 4 is bonded to the flexible printed coil, the solder paste 5 is spread by the accommodating function of the accommodating recess 112, and when the solder paste 5 is reflow soldered and cured, the temperature of the first soldering portion 221 is high, and the flux 50 in the solder paste 5 causes the solder alloy 51 to shrink toward the first soldering portion 221 without interference, so as to reduce the solder ball phenomenon caused by the non-shrinkage after the solder paste is spread. Meanwhile, since there is a large amount of solder paste 5, during reflow soldering, the solder alloy 51 in the solder paste 5 covers the upper surface and the periphery of the convex hull 2211, and after a part of the soldering flux 50 is volatilized, the remaining soldering flux 50 is at least located around the main body 2210 in the accommodating groove 112.

Referring to fig. 12, in the present invention, when the amount of the solder paste 5 on the first soldering portion 221 is small, and when the solder paste 5 is reflowed and solidified, the temperature of the first soldering portion 221 is high, the soldering flux 50 in the solder paste 5 causes the solder alloy 51 to shrink toward the first soldering portion 221 without interference, and meanwhile, since the convex hulls 2211 with smaller upward protruding areas than the main body 2210 are formed on the first soldering portion 221, due to the "tin climbing phenomenon", the solder alloy 51 gathers toward the convex hulls 2211 and automatically flows upward along the convex hulls 2211, even if the amount of the solder paste 5 is small, the top surface of the convex hulls 2211 still has the solder alloy 51 attached, and even if the solder alloy 51 is entirely gathered to cover the upper surface and the periphery of the convex hulls 2211, and similarly, after a part of the soldering flux 50 volatilizes, the remaining soldering flux 50 is located at least at the periphery of the main body 2210 in the accommodating groove 112.

In summary, under the condition of a large amount or a small amount of the solder paste 5, the design of the accommodating groove 112 and the convex hull 2211 can make the convex hull 2211 be covered with the tin alloy 51, which is beneficial for the first welding part 221 of the metal circuit 2 to be welded with the flexible printed coil 4, so that the situations of cold joint, empty joint, solder balls and the like generated when the flexible printed coil 4 is welded with the metal circuit 2 can be reduced, and the production yield can be improved.

As shown in fig. 13, in the second embodiment of the present invention, the convex hull 2211 'on the first welding portion 221' is formed into an approximately arch bridge shape, the convex hull 2211 'in the arch bridge shape can be fixed to the main body 2210 by pressing, welding or the like, the convex hull 2211' has an arc-shaped outer edge surface and also has a function of gathering tin substantially the same as that of the cylindrical convex hull 2211, and therefore, the metal circuit 2 and the flexible printed coil 4 can be welded effectively and at a high yield rate. In other embodiments of the present invention, the shape of the convex hull may be a structure having a curved outer edge for facilitating tin-climbing, such as a hemisphere or a cone.

Of course, the arrangement of the convex hull 2211' and the receiving groove 112 can also be applied between the second soldering portion 222 and the receiving groove 113, so as to make the soldering between the chip 6 and the metal circuit 2 more stable, and so on, and also can be applied to the case of the base assembly 1000 of other voice coil motors requiring face-to-face soldering.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

The above description is only a part of the embodiments of the present invention, and not all embodiments, and any equivalent variations of the technical solutions of the present invention, which are made by those skilled in the art through reading the present specification, are covered by the claims of the present invention.

Claims

1. The utility model provides a voice coil motor's base combination, includes voice coil motor's that mutually supports base and electronic component, voice coil motor's base include the plastic base and set up in the metal circuit of plastic base, electronic component attached in the plastic base an upper surface and with metal circuit electric property welding, metal circuit includes a plurality of branches, and is a plurality of the one end interval of branch road is arranged and is formed and expose in the outer pin end of plastic base, wherein two wherein at least in the branch road the other end of branch road is arranged and is formed the welding extremely electronic component's welding end, the welding end expose in the plastic base the upper surface, its characterized in that: the plastic base the concave recess that holds that is formed with of upper surface, it has a basal surface to hold the recess, the welding end includes a main part and protruding locating of main part be close to at least one convex closure of one side of electronic component, the main part be equipped with expose in hold the last wall of recess, the convex closure certainly go up the wall to the electronic component is protruding to be established, the area of going up the wall is less than the area of basal surface, the welding end with through the tin cream welding between the electronic component.

2. The voice coil motor base assembly of claim 1, wherein: the convex hull is a cylindrical or arch bridge-shaped structure protruding from the main body part, and the area of the convex hull is smaller than that of the upper wall surface of the main body part.

3. The voice coil motor base assembly of claim 1, wherein: the electronic element is provided with a conducting strip corresponding to the convex hull, a gap is formed between the upper surface of the convex hull and the conducting strip, and the solder paste is at least filled into the gap.

4. A pedestal assembly for a voice coil motor as claimed in claim 3, wherein: the electronic element is provided with a sunken part for accommodating the convex hull, the conducting strip is arranged in the sunken part in an exposed manner, and the thickness of the conducting strip is smaller than the depth of the sunken part.

5. The voice coil motor base assembly of claim 1, wherein: the depth of the accommodating groove in the vertical direction is smaller than the thickness of the plastic base.

6. The voice coil motor base assembly of claim 5, wherein: the main body part of the welding end is embedded in the accommodating groove, and the upper wall surface is flush with the bottom surface or higher than the bottom surface.

7. The voice coil motor base assembly of claim 6, wherein: the solder paste comprises soldering flux and tin alloy which are formed by mixing in proportion, the tin alloy at least wraps the upper surface and the periphery of the convex hull, and the soldering flux is at least positioned on the periphery of the main body part in the accommodating groove.

8. The voice coil motor base assembly of claim 6, wherein: an area ratio of the upper wall surface to the bottom surface of the receiving groove ranges from 1/2 to 2/3.

9. The voice coil motor base assembly of claim 8, wherein: the area ratio of the upper wall surface to the bottom surface of the accommodating recess is 7/13.

10. The voice coil motor base assembly of claim 1, wherein: the branch circuit is made of copper, the upper wall surface of the welding end is plated with metal tin or gold, and the surface of the convex hull is plated with metal tin or gold.

11. The voice coil motor base assembly of claim 1, wherein: the convex hull is formed by integrally stamping the main body part or riveting the main body part.

12. The voice coil motor base assembly of claim 1, wherein: the electronic component is a flexible printed coil, the plastic base is provided with side walls protruding upwards from the periphery of the upper surface and an accommodating cavity formed by the side walls in an enclosing mode, and the flexible printed coil is accommodated in the accommodating cavity and is adhered and positioned with the plastic base through glue.

13. The voice coil motor base assembly of claim 1, wherein: the welding end is electrically welded with the electronic element through a surface mounting technology.

14. The utility model provides a base of voice coil motor, include the plastic base and set up in the metal circuit of plastic base, metal circuit includes a plurality of branch roads, and is a plurality of the one end interval of branch road is arranged and is formed and expose in the outer pin end of plastic base, at least wherein two among the branch roads the other end of branch road is arranged and is formed and be located the welding end in the plastic base, the welding end is used for welding with electronic component, the welding end expose in an upper surface of plastic base, its characterized in that: the plastic base the concave recess that is formed with of upper surface, it has a basal surface to hold the recess, the welding end includes a main part and protruding locating at least one convex closure of main part, the main part be equipped with expose hold the last wall of recess, the convex closure certainly go up the wall to electronic component is protruding to be established, the area of going up the wall is less than the area of basal surface, the welding end with through the tin cream welding between the electronic component.

15. The base of a voice coil motor of claim 14, wherein: the convex hull is a cylindrical or arch bridge-shaped structure protruding from the main body part, and the area of the convex hull is smaller than that of the upper wall surface of the main body part.

16. The base of a voice coil motor of claim 15, wherein: the depth of the accommodating groove in the vertical direction is smaller than the thickness of the plastic base.

17. The base of a voice coil motor of claim 16, wherein: the main body part of the welding end is embedded in the accommodating groove, and the upper wall surface is flush with the bottom surface or higher than the bottom surface.

18. The base of a voice coil motor of claim 17, wherein: an area ratio of the upper wall surface to the bottom surface of the receiving groove ranges from 1/2 to 2/3.

19. The base of a voice coil motor of claim 17, wherein: the area ratio of the upper wall surface to the bottom surface of the accommodating recess is 7/13.